package network2;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.Scanner;

public class TcpEchoClient {
    private Socket socket = null;

    public TcpEchoClient(String serverIp,int port) throws IOException {
        // 这个操作相当于让客户端和服务器建立tcp连接
        // 这里的连接连上了,服务器的accept就会返回
        socket = new Socket(serverIp,port);
    }

    public void start() {
        Scanner scanner = new Scanner(System.in);
        try (InputStream inputStream = socket.getInputStream();
             OutputStream outputStream = socket.getOutputStream()){
            PrintWriter printWriter = new PrintWriter(outputStream);
            Scanner scannerFromSocket = new Scanner(inputStream);
            while (true) {
                // 1-从键盘上读取用户输入的内容
                System.out.print("->");
                String request = scanner.next();
                // 2-把读取的内容构造成请求,发送给服务器
                // 这里的发送是带有换行的
                printWriter.println(request);
                printWriter.flush();//刷新缓冲区
                // 3-从服务器读取相应内容
                String response = scannerFromSocket.next();
                // 4-把响应结果显示到控制台上
                System.out.printf("[req: %s resp %s\n]",request,response);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) throws IOException {
        TcpEchoClient client =
                new TcpEchoClient("127.0.0.1",9090);
        client.start();
    }
}
